>>president obama and the first lady left for south africa this morning. where a huge memorial for nelson mandela is planned for tuesday. >> catherine: at least 90 world leaders will attend. former presidents bill clinton, george w. bush and jimmy carter will be there. >> catherine: so will prince charles, oprah, -- and the pope. and if organizers have their way -- it will 'not' be a somber experience. but a big loud and happy event - like the spontaneous street celebrations happening today in south africa. >> catherine: the service will be in the huge soccer stadium which hosted the 20- 10 world cup. it's also the place where mandela gave his first speech after being released from prison. today security sweeps and other final preparations were being made. >> catherine: about 90- thousand citizens will be allowed to attend - on a first come, first serve basis. there will be no tickets. mandela spent 27 years in prison before becoming his country's first black president. he died thursday at the age of 95. assess >> pam: the problem with the new 49ers stadiu